Re: Como acceder al bit x de un dato

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#9512

From: Santiago Intxausti
Date: Tue, 18 Jun 2002 21:52

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Angel wrote:

> Suponiendo q tenemos un dato de n bytes, com podria acceder al bit x??
> en C o C++.
> 
> ej:
> 
> bool cual_es_el_valor_del_bit(n_bit);
> 
> 
Muy facil, el metodo se llama enmascaramiento.

Se hace de la siguiente manera:

[valor_bit] = [byte] & [mascara];

Mascara

bit N�0 = 1(decimal)
bit N�1 = 2
bit N�2 = 4
bit N�3 = 8
bit N�4 = 16
bit n�5 = 32
bit n�6 = 64
bit n�7 = 128

Ejemplo:
Si quieres sacar el valor del bit n�4 para guardarlo en la variable "bit" de 
la variable "byte" seria de la siguiente manera.

bit = byte & 16

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From: Santiago Intxausti <intxausti@intxausti.net>
Newsgroups: es.comp.os.linux.programacion
Subject: Re: Como acceder al bit x de un dato
Date: Tue, 18 Jun 2002 23:52:57 +0200
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